. Author manuscript; available in PMC: 2022 Sep 1.

Published in final edited form as: Matern Child Health J. 2021 May 21;25(9):1455–1464. doi: 10.1007/s10995-021-03139-x

Table 3.

Associations between exposure to the John F. Kennedy assassination and birthweight for gestational age and sex z-score in the total sample (n = 30,239) and sibling sample (n = 1144 pairs) using linear regression

	Unadjusted		Adjusted^a
	β	95% CI	β	95% CI
Total Sample
Unexposed	Reference
First trimester	−0.05	−0.09, −0.01	−0.05	−0.09, −0.01
Second trimester	0.01	−0.03, 0.06	0.00	−0.05, 0.05
Third trimester	−0.03	−0.08, 0.02	−0.03	−0.08, 0.02
Sibling sample
Unexposed	Reference
First trimester	0.08	−0.01, 0.16	0.26	−0.02, 0.55
Second trimester	0.21	0.12, 0.30	0.36	0.07, 0.65
Third trimester^b

CI confidence interval

Total sample models adjusted for maternal age, race, parity, education, smoking status, body mass index, and study site. Sibling models adjusted for differences in maternal age, body mass index, and smoking status

Not evaluated due to bias introduced in sibling pairs exposed in the third trimester (exposed pregnancy likely to have greater gestational age than unexposed pregnancy because exposed pregnancy needed to continue long enough into the third trimester to become exposed and be included in the analysis)